That fitting is a plastic, very cheap backflow preventer (anti siphon). It's crap. I took mine out and put a shark bite 90 degree elbow and use a backflow preventer on the hose connection outside, you can purchase one at any hardware store. Good luck. Very common problem.
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JimQ
2012 Ford F 250 Super Duty Lariat 6.2 ; 3.73
2022 KZ C271BKHSE
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